(function (E) {
	E.fn.drag = function (L, K, J) {
		if (K) {
			this.bind("dragstart", L)
		}
		if (J) {
			this.bind("dragend", J)
		}
		return !L ? this.trigger("drag") : this.bind("drag", K ? K : L)
	};
	var A = E.event,
	B = A.special,
	F = B.drag = {
		not : ":input",
		distance : 0,
		which : 1,
		dragging : false,
		setup : function (J) {
			J = E.extend({
					distance : F.distance,
					which : F.which,
					not : F.not
				}, J || {});
			J.distance = I(J.distance);
			A.add(this, "mousedown", H, J);
			if (this.attachEvent) {
				this.attachEvent("ondragstart", D)
			}
		},
		teardown : function () {
			A.remove(this, "mousedown", H);
			if (this === F.dragging) {
				F.dragging = F.proxy = false
			}
			G(this, true);
			if (this.detachEvent) {
				this.detachEvent("ondragstart", D)
			}
		}
	};
	B.dragstart = B.dragend = {
		setup : function () {},
		teardown : function () {}

	};
	function H(L) {
		var K = this,
		J,
		M = L.data || {};
		if (M.elem) {
			K = L.dragTarget = M.elem;
			L.dragProxy = F.proxy || K;
			L.cursorOffsetX = M.pageX - M.left;
			L.cursorOffsetY = M.pageY - M.top;
			L.offsetX = L.pageX - L.cursorOffsetX;
			L.offsetY = L.pageY - L.cursorOffsetY
		} else {
			if (F.dragging || (M.which > 0 && L.which != M.which) || E(L.target).is(M.not)) {
				return
			}
		}
		switch (L.type) {
		case "mousedown":
			E.extend(M, E(K).offset(), {
				elem : K,
				target : L.target,
				pageX : L.pageX,
				pageY : L.pageY
			});
			A.add(document, "mousemove mouseup", H, M);
			G(K, false);
			F.dragging = null;
			return false;
		case !F.dragging && "mousemove":
			if (I(L.pageX - M.pageX) + I(L.pageY - M.pageY) < M.distance) {
				break
			}
			L.target = M.target;
			J = C(L, "dragstart", K);
			if (J !== false) {
				F.dragging = K;
				F.proxy = L.dragProxy = E(J || K)[0]
			}
		case "mousemove":
			if (F.dragging) {
				J = C(L, "drag", K);
				if (B.drop) {
					B.drop.allowed = (J !== false);
					B.drop.handler(L)
				}
				if (J !== false) {
					break
				}
				L.type = "mouseup"
			}
		case "mouseup":
			A.remove(document, "mousemove mouseup", H);
			if (F.dragging) {
				if (B.drop) {
					B.drop.handler(L)
				}
				C(L, "dragend", K)
			}
			G(K, true);
			F.dragging = F.proxy = M.elem = false;
			break
		}
		return true
	}
	function C(M, K, L) {
		M.type = K;
		var J = E.event.handle.call(L, M);
		return J === false ? false : J || M.result
	}
	function I(J) {
		return Math.pow(J, 2)
	}
	function D() {
		return (F.dragging === false)
	}
	function G(K, J) {
		if (!K) {
			return
		}
		K.unselectable = J ? "off" : "on";
		K.onselectstart = function () {
			return J
		};
		if (K.style) {
			K.style.MozUserSelect = J ? "" : "none"
		}
	}
})(jQuery);